NTG-9
is one of our polyurethane gel formulations designed to service
applications requiring a soft elastomeric material with good cushioning
effect, better strength, and less tacky surface than commonly available
polyurethane gel formulations.

Whereas
typical polyurethane gel formulations are used with another film or
fabric materials covering the product surface, NTG-9 may not require
such a surface-covering structure. This allows a user to make
stand-alone polyurethane gel parts in mold without prefabrication of
flexible film/laminate material. The low viscosity values of the
component materials allow easy handling and replication of the mold surface
at a high resolution.

Same as
other polyurethane gel materials, NTG-9 does not bottom-out as easily as
flexible foams. NTG-9 can be used in cushioning/padding products as
pressure-point support segments supplementing flexible foam cushions.
NTG-9 may also be used to make grips and padding parts for various
products such as sporting goods, exercise equipment, and tools.

NTG-9
can be used in similar applications to where TPE (thermoplastic
elastomer) class polymers have been used for. Whereas TPE polymers
require high heat and high pressure injection molding process, NTG-9 can
be processed at room temperature* in ambient pressure molds.

(Note*:
Although it can cure at room temperature, mold temperature of 120 – 140
˚F is recommended for a less tacky surface.)

Physical Properties

Physical PropertiesTypical Values

Hardness: Shore OO 50 - 60 Durometer*

Elongation 839%

Tensile
Strength
62 psi

Die-C
Tear Resistance 25 pli

Split
Tear Resistance 11 pli

Bashore
Rebound: 20%

Natural
Color: Translucent with some haze and yellow tint

(Hardness between open top and bottom surface vary widely if processed
with an open top mold. Unlike other gel formulas, this material does
not allow ration adjustment to change the product consistency to be
yielded. You may use various plasticizer products to soften the
material.)

Designations

System Code:
NTG-9

Part-A (Isocyanate) Component: MPB-028

Part-B (Curative) Component:
PNB-131

Processing Temperature

Part-A Component: Ambient

Part-B Component: Ambient

Mold Temperature: 120 – 140 ˚F

Ratio
Information

Mixing Ratio:
100: 480= Part-A: Part-B by Volume

(100: 443 by weight)

NCO
Index: 1.018

Curing
Pattern

Pot-Life: 9 to 10 minutes

Demolding Time: 1 to 2 hours

Complete Cure: 3 to 5 days at room temperature

Component Materials (Typical Properties)

Part-A: MPB-028 (Isocyanate)

General Description: Isocyanate Terminated Prepolymer based on MDI
and polyether polyol

NCO: 14.5%

Equivalent Weight: 290

Specific Gravity (Theoretical at 77 ˚F): 1.108 grams/cm3

Viscosity at 77 ˚F: 450 – 550 cps

Storage/Handling: Store indoor at room temperature between 72 ˚F
and 90 ˚F. The container head space must be purged to blanket the
material with dry nitrogen gas or argon gas.

Part-B:
PNB-131 (Curative)

General Description: Curing Agent (Curative) based on a blend
polyether polyol, additives, and catalyst

Part-A
component (prepolymer) contains isocyanate component, which is highly
sensitive to moisture. If it is left in air, part-A will react with
atmospheric moisture and will be ruined. This reaction is
non-reversible. Soon after opening the container to dispense the
content, dry nitrogen gas or argon gas needs to be injected to the
container to purge and blanket the head space. Please consult Northstar
Polymers for nitrogen gas set-up information.

For gravity
feeding system from a 55-gallon, silica gel or calcium chloride
desiccant filter(s) should be installed to the vent-hole of the drum. A
valve to inject dry nitrogen gas can be installed instead.

Store the
containers a dry indoor storage within the temperature range between 77
and 90 ºF. Avoid direct sunlight, high humidity, and high temperature.

Note:

The prepolymer
used for this formulation contains different isocyanate isomers with
different freezing points. When the product is shipped in cold season,
the isocyanate isomers and extended prepolymer may separate into layers
in the container. During the cold season, the container must be heated
to about 120 ˚F and agitated to ensure homogeneous blend before use.
The material should stay as liquid at room temperature. To avoid
separation during the storage, store it in between 72 ˚F and 90 ˚F
storage temperature range.

If a large
amount of water mixes with a large amount of isocyanate base materials,
the chemical reaction may produce a large amount of CO2 gas and heat to
create a hazardous condition. Keep the storage area free of water.

Under a certain
combination of heat, catalyst (basic chemicals), amounts of reactive
materials, and some other favorable conditions for the reaction, the
water (or alcohol/glycol/amine) to isocyanate reaction can reach a
dangerous state of accelerated reaction. The accelerated reaction may
create a very high temperature condition. The thermal decomposition of
isocyanate based material by extremely high temperature or fire can
produce toxic gasses and smokes. Please be sure that the containers are
stored in dry indoor storage, away from source of large amount of water.

If a leak is
found in a drum, please place the drum in such a position that the
leaking part is at the highest part of drum so that the content no
longer leaks out. Cover the leaking area with dry towel to prevent air
from entering. If possible, transfer the material into new container(s)
with nitrogen purge. If moisture enters into an isocyanate container
from a small leakage, CO2 gas may be produced to gradually pressurize
the container. If pressure built up is suspected, open the bung (or
cap) very slowly to release the pressure before you change the drum
position.

Part-B
(Curative) Component

Part-B
component is hygroscopic. If the material is exposed to ambient air, it
absorbs moisture. Part-B component contaminated by moisture can become a
source excessive bubbles in the product, and/or causes the parts to cure
improperly after mixed with part-A. Avoid exposure of the material to
moisture in air.

Purging the
empty space in the container with dry nitrogen gas, argon gas, or
negative-40-degree-due-point dry air is also recommended to prevent
moisture contamination of part-B as well. (However, simply keeping the
material in an airtight container may also be sufficient depending on
the moisture level of the work place and duration of the exposure.)

Store it in a
dry indoor storage at a room temperature between 65 and 90 ºF. Avoid
direct sunlight.

Note: Moisture
contamination of part-B material can be reversed by heating material to
180 ºF and vacuuming it at about 29" Hg or above negative pressure for
20 to 40 minutes.

Part-B material
contains chemical constituents that can separate during the storage.
Agitation of the part-B content before dispensing may be required for
the system. Separation can be seen in a higher degree when the material
is stored in cold temperature for a long time. You may need to heat to
re-blend the separated material in some cases. Please consult Northstar
Polymers when separation is suspected.

Safety:

The component
materials are industrial-grade chemicals. Please keep them in a secure
place and prevent access from any unauthorized individual. The
personnel who handle these materials need to read the Safety Data Sheet
(SDS) for detail information on safety and handling of the materials.
The SDS for each component is sent with the shipment of the material.

When using this
material, be sure to operate in a wide open area with good air movement,
or in a well-ventilated area. Wear rubber gloves, long sleeves, and
protective eyeglasses to prevent skin/eye contact of the material. When
your operation involves heating or spraying of the material, and if you
expect the isocyanate content level in the workplace atmosphere may
become above the threshold regulated by OSHA or by other appropriate
working place safety standard, we recommend, in addition to the above,
installation of a proper hooded dynamic ventilation system and/or using
an appropriate type of respirator (such as a full-face respirator
equipped with OSHA approved HEPA filters for particulate and organic
vapor) to prevent inhalation of the fume.

Direct contact
of polyurethane raw materials to skin/eye, as well as ingestion may lead
to health problems. No eating or smoking should be permitted at the
working area. The operator should wash hands well with soap and water
after handling the materials and follow the other procedures of the
Standard Industrial Hygiene Practices. Please refer to the SDS for each
component for the detailed health information.

Notice:
All of the statements, recommendations, suggestions, and data concerning
the subject material are based on our laboratory results, and although
we believe the same to be reliable, we expressly do not represent,
warrant, or guarantee the accuracy, completeness, or reliability of
same, or the material or the results to be obtained from the use
thereof, neither do we warrant that any such use, either alone or in
combination with other materials, shall be free of the rightful claim of
any third party by way of INFRINGEMENT or the like, and NORTHSTAR
POLYMERS DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, OF
MERCHANTABILITY and FITNESS FOR A PARTICULAR PURPOSE.

Notice:
All of the like, and NORTHSTAR
POLYMERS DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, OF
MERCHANTABILITY and FITNESS FOR A PARTICULAR PURPOSE.